TL/F/9794
9338/DM9338
8-Bit
Multiple
Port
Register
June 1989
9338/DM9338 8-Bit Multiple Port Register
General Description
The DM9338 is an 8-bit multiple port register designed for
high speed random access memory applications where the
ability to simultaneously read and write is desirable. A com-
mon use would be as a register bank in a three address
computer. Data can be written into any one of the eight bits
and read from any two of the eight bits simultaneously.
Connection Diagrams
Dual-In-Line Package
TL/F/9794–1
Order Number 9338DMQB, 9338FMQB or DM9338N
See NS Package Number J16A, N16E or W16A
Pin Names Description
A0–A2 Write Address Inputs
D
A
Data Input
B0–B2 B Read Address Inputs
C0–C2 C Read Address Inputs
CP Clock Pulse Input (Active Rising Edge)
SLE Slave Enable Input (Active LOW)
Z
B
B Output
Z
C
C Output
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C
1995 National Semiconductor Corporation RRD-B30M115/Printed in U. S. A.